I have a 2015 half ton eco diesel with 34,000 miles on. Yesterday I received a msg to check the electronic throttle control and suddenly could not go more than 35 mph. Took it in today and was told my exhaust system was 99% plugged. And I'm supposed to get the fuel filter changed every 30,000 miles. HOW does the exhaust system plug up on a vehicle like this and what can I do to prevent in the future?